Invest MSC-24/QD FP, Service Manual

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9.2.7 P2(temperature protection of compressor top) diagnosis and solution.
Is the indoor temperature
and evaporator sensor
connector and connection
good?
9.2.5 P0(Inverter module over-strong current protection) diagnosis and solution.
9.2.6 P1(over voltage or too low voltage protection) diagnosis and solution.
Is all connections on PCB
and between PCB and
compressor good?
Repair or correct the
connector or connection.
Replace the outdoor PCB
and then repower on. Is
the failure cleared?
NO
YES
Check the compressor
NO
Repair the connector and
reconnect
NO
YES
Replace the sensor and
check if E6 display again?
Replace the indoor PCB
YES
Is the power supply good?
Be sure the power supply is
normal when using the units
NO
YES
Replace the outdoor e-box.